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BROWN BAG HOMEWORK #12                  NAME________________
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.             "THUMB THINGS ARE VERY IMPORTANT"
.
MATERIALS FROM HOME: tape, pair of pants with button at waist, shoes with
laces, straight back chair, pencil, marker, paper assorted coins, plastic
drinking glass,
various size and shape objects, chopsticks, article of
clothing with a zipper.
.
INTRODUCTION:
.   Only apes and primates have hands that are able to grasp
objects. The grasp is made possible by the "opposable thumb". It is called this
because it moves opposite the rest of the fingers. In humans, the thumb can
move farther across
the hand than in any other primate. in this experiment you will compare your
performance of a series of tasks using your thumb and fingers together with
your performance of the same tasks without the aid of your thumb.
.
1. Think about all of the ways that you use your hands during the day. List 3
tasks that you do in which your thumb is important. ________________
________________________
.
. ______________________________________
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2. List 3 tasks (with your hand) in which the use of your thumb is not
important. ___________________________________
__________________________  _______________________________
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3. Make 3 observations about your hand--specifically about the relationship of
your thumb to the rest of your fingers and the rest of your hand.
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4. Predict whether each of the following tasks will be easy or difficult to
perform without the use of your thumb. (You have to imagine that your thumb is
not longer attached to your hand.)
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.        TASKS                                   PREDICTION
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a. Write your name with a marker on large paper
b. Write your name with a pencil on small paper
c. Unbutton and rebutton the waist on your jeans
.      while wearing them
d. Tie your shoes
e. Pick up a straight-back chair
f. Pick up several coins
g. Pick up a drinking glass
h. Open and close a door using the doorknob
i. Try using chopsticks (use two pencils if you don't
        have chopsticks)
j. Pick up and move several objects of various shapes
        and sizes
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5. Now, perform the above tasks as you normally would, using your thumb and
fingers. Pay special attention to your thumb and its involvement in these
tasks. Enter your observations on the data table about whether it was difficult
or easy to do each task and what the level of "thumb involvement" was.   Be
very descriptive in your observations.
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